JPH04347635A - Manufacture of rotary screen - Google Patents

Abstract

PURPOSE:To provide the manufacture of a rotary screen, in which a critical defect, in which a pattern is parted by a white line as seen in conventional devices, is solved while largely simplifying exposure printing operation and which belongs to a galvano method, in which there is not possibility that cracks are generated in the screen when the block of the continuous foundation pattern is formed. CONSTITUTION:The dot sections of a mesh image are endless laser-exposed by laser beams R by supporting both ends of a roll 1 coated with a high sensitivity photosensitive film and rotary-scanning the roll 1 and moving and scanning a large number of laser beams R arrayed to said roll in required number in the roll-surface longitudinal direction while being flickered and driven respectively on the basis of the electronic data of the proper mesh image, a negative resist image, on which dots P remain, is formed through subsequent developing, and the roll is plated with nickel and the foundation section of the periphery of the resist image is buried with nickel and a rotary screen is formed through plating and peeled from the roll.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for manufacturing a rotary screen belonging to the galvano method, which is obtained by forming a negative resist image on a roll, plating it with nickel, and peeling off the nickel-plated sleeve.
In particular, the present invention relates to a method of manufacturing a rotary screen that allows an endless mesh image to be obtained.

0002

[Prior Art] Fig. 3(a) shows a conventional rotary screen S of 0.2 to 0.3 m in which no mesh is formed.
It has a straight portion extending in the longitudinal direction of the surface with a width of m. The rotary screen S is a thin nickel cylindrical plate with a wall thickness of about 1 mm, and has regular hexagonal holes a in a diagonal array as shown in FIG. 3(b). or, as shown in FIG. 3(c), square holes b are arranged in regular rows to form a mesh image.
Ink is supplied from inside and an internal doctor scrapes the inner surface of the rotary screen to allow the ink to seep through the mesh and print. The rotary screen S generally has 60, 80, 100 or 120 screen lines per inch.

[0003] There are three methods for manufacturing rotary screens: a lacquer method, a galvano method, and an etching method. In the galvano method, as shown in FIG. After coating the film 2, a negative mesh image film 3 is overlaid on the photoresist film 2, and a negative mesh image is printed and exposed all around the roll using a UV light source 4 in the manner shown in FIGS. 4(a) to (e).
Next, it is developed to form a negative resist image 5 as shown in FIG. 3(e), and then nickel plated to form a continuation of the resist image 5 in a raised manner as shown in FIG. 3(f). When the roll 1 is filled with nickel plating 6 and then a shearing force is applied in the circumferential direction, the nickel plating 6 is easily peeled off from the roll 1, and the rotary screen S shown in FIG. 3(a) is obtained.

FIG. 4(a) shows the first step of exposure printing, in which a roll 1 coated with a photosensitive film is chucked at both ends with chucks 7, 7 of an exposure machine, and the negative mesh is formed on the upper surface of the roll 1. One end of the image film 3 is fixed with a transparent adhesive tape 8, and the mask tape 9 is precisely aligned with the edge of the film 3, overlapped with the adhesive tape 8, and adhered. FIG. 4(b) shows the second step of exposure and baking, in which the roll 1 is moved so that the mask tape 9 is located at the irradiation position of the UV light source 4.
by aligning the arrows X and rotating the roll 1.
This is where exposure printing begins in the direction shown in . Figure 4(c)
) shows the third step of exposure baking, and after the required time has elapsed from the start of exposure baking, mask tape 9 is placed on the opposite side of roll 1.
When the mask tape 10 is lined up and exposed to the area where it is to be adhered, the irradiation of the UV light source 4 is cut off and at the same time the roll 1 is
The rotation of the mask tape 10 is stopped, and the mask tape 10 is attached very carefully to the mask tape 9 so as to be separated from the mask tape 9 by 0.2 to 0.3 mm. FIG. 4(d) shows the fourth step of exposure and printing, in which the mask tape 9 is peeled off and the other end of the mesh image film 3 is fixed on the mask tape 10 with an adhesive tape 11. FIG. 4(e) shows the fifth step of exposure printing, in which the rotation of the roll 1 is continued at the same time as the UV light source 4 is unblocked, and the mask tape 10 is exposed to the UV light source 4.
When the UV light source 4 reaches the irradiation position, the rotation of the roll 1 is stopped at the same time as the irradiation of the UV light source 4 is stopped, and the exposure and printing of one rotation of the roll is completed.

[0005]

As described above, according to the conventional rotary screen manufacturing method using the galvano method, the mask tape 10 is mixed with the mask tape 9 by 0.
For example, as shown in Figure 5 (
As shown in a), the regular hexagonal holes a, which are formed in countless diagonal rows on the rotary screen to form a mesh image and serve as ink outlets, are located at the beginning and end of exposure printing.
That is, it is not formed at all in the position corresponding to the gap between the mask tapes 9 and 10, and therefore, the printed matter has a fatal defect in that it becomes a white line to which no ink is transferred and divides the mesh image. For this reason, with conventional rotary screens manufactured using the galvano method, it was not possible to print a continuous pattern, or a continuous pattern was printed by having skilled workers modify the screen by enlarging the hole a at the seam. Even if the gap between the mask tapes 9 and 10 is eliminated and complete endless exposure printing is performed, as shown in FIG. 5(b),
The holes a at the beginning and end of the exposure printing are connected, and as shown in FIG. 5(c), large cracks c occur throughout the entire length, making it impossible to construct the rotary screen S.

The present invention has been devised in view of the above-mentioned points, and eliminates the fatal drawback of the conventional pattern in which the pattern is divided by white lines when forming a plate with a continuous background pattern. At the same time, the exposure and printing work can be greatly simplified.
It is an object of the present invention to provide a method for manufacturing a rotary screen belonging to the galvano method without the risk of cracking the screen.

[0007]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the present invention provides a method in which a roll 1 coated with a highly sensitive photoresist film is supported at both ends and rotated for scanning, and a large number of films are coated on the roll as required. By moving and scanning the arrayed laser beams R in the longitudinal direction of the roll surface while blinking and driving the arrayed laser beams R based on the electronic data of the appropriate mesh image, the halftone dot portion of the mesh image is endlessly exposed to the laser beam R, A method for manufacturing a rotary screen, in which a negative resist image with halftone dots P is formed through subsequent development, and then nickel plated to fill the base area around the resist image with nickel to form a rotary screen and peeled off from the roll. It provides:

[0008]

[Embodiment] An embodiment of the rotary screen manufacturing method of the present invention will be described with reference to FIGS. 1, 2(a) and 2(b). First, an argon ion laser with a wavelength of 488 nanometers is applied to a roll that has a surface quality that allows the nickel plating to be easily removed, specifically a stainless steel roll, a nickel roll with an oxide film, or a copper roll with an organic film. A photosensitive agent (polymer) that reacts with ion is coated to form a uniform thin film and dried to form an argon ion laser-reactive high-sensitivity photosensitive film. Argon ion laser-reactive high-sensitivity photoresist films are easily oxidized and lose their photosensitivity when oxidized, so to prevent oxidation, they are coated with a transparent protective film such as polyvinyl alcohol and dried. Next, as shown in FIG. 1, the roll 1 is supported at both ends by chucks 12, 12 of the laser exposure and printing device and rotated and scanned, and at the same time, a large number of rolls are arranged in series from the laser head 13 of the laser exposure and printing device. wavelength is 48
By oscillating an 8 nanometer argon ion laser beam R in a blinking manner based on the electronic data of an appropriate mesh image and moving and scanning it in the longitudinal direction of the roll surface, as shown in FIG. 2(a), Endless laser exposure is performed to form a mesh image of regular hexagonal halftone dots P in a spiral regular diagonal array. Thereafter, the roll 1 is removed, immersed in a developer, and rotated to form a negative resist image in which halftone dots P remain. After that, the roll 1 is immersed in a nickel plating solution, rotated, and energized to nickel plate the roll 1. As shown in Fig. 2(b), the continuous area around the resist image 5 is filled with nickel 6, and then the roll 1 is rotated. After plating the screen, the roll 1 is supported at both ends and rotated at low speed to press a soft resistor to apply shear pressure in the circumferential direction to the nickel plating. It is easily peeled off from the roll 1 to obtain a rotary screen.

[0009]

[Effects of the Invention] As explained above, according to the rotary screen manufacturing method of the present invention, by development,
A rotary screen manufacturing method using the galvano method (plating method) that uses endless laser exposure so that the halftone dots are arranged in a spiral diagonal array or array to form a negative resist mesh image. This eliminates the fatal drawback of dividing the pattern with white lines when forming a plate with a continuous background pattern, and also greatly simplifies the exposure and printing process. There is no risk of cracking.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view for explaining laser exposure printing, which is a main step of the rotary screen manufacturing method of the present invention.

FIG. 2(a) is a local enlarged view showing halftone dot array exposure in the laser exposure and baking process of the rotary screen manufacturing method of the present invention, and FIG. 2(b) is a local enlarged view of the roll surface after the nickel plating process is completed.

[Fig. 3] (a) is a perspective view of a rotary screen manufactured by the conventional galvano method, (b) is a locally enlarged view showing the arrangement of holes when the conventional screen mesh consists of regular hexagonal holes; c) is a locally enlarged view showing the arrangement of holes when the conventional screen mesh consists of square holes; (d) is a locally enlarged cross-sectional view of the exposure and baking process of the conventional rotary screen manufacturing method; (e)
(f) is a partially enlarged sectional view of the nickel plating process of the conventional rotary screen manufacturing method.

FIGS. 4(a) to 4(e) are schematic front views showing the first to fifth steps, which are exposure and baking steps of a conventional rotary screen manufacturing method;

[Figure 5] (a) shows the beginning and end of exposure printing at 0.2
An enlarged view of a local area corresponding to the seam of exposure and printing of a conventional rotary screen separated by ~0.3 mm, (b
) is an enlarged view of a conventional rotary screen corresponding to the seam of exposure and printing of a conventional rotary screen in which the beginning and end of exposure printing are wrapped, and (c) is a perspective view of a conventional rotary screen in which the beginning and end of exposure and printing are wrapped. figure.

[Explanation of symbols]

S Rotary screen a Regular hexagonal hole b Square hole 1 roll 2 Photosensitive film 3 Film 4 UV light source 5 Resist image 6 Nickel plating 7. Exposure machine chuck 8 Adhesive tape 9 Mask tape 10 Mask tape 11 Adhesive tape c Crack R Laser light P Halftone dot

Claims (1)

[Claims] Claim 1: A roll coated with a high-sensitivity photosensitive film is supported at both ends and rotated for scanning, and a number of laser beams arranged in a required manner are driven to flicker on the roll based on electronic data of an appropriate mesh image. By moving and scanning in the longitudinal direction of the roll surface, the halftone dots of the mesh image are endlessly exposed to laser light, and then developed to form a negative resist image in which halftone dots remain, and then nickel plated. A method for manufacturing a rotary screen in which the base area around the resist image is filled with nickel, a rotary screen is plated, and the rotary screen is peeled off from the roll.